Make that 222-10 for ChrgVtgFlo, not 220-10 Kirk
On Sun, Nov 12, 2023 at 3:05 PM Kirk Bailey <k...@abundantsolar.com> wrote: > I went back and looked at my notes on my recent adventure with closed loop > SI to eFlex Fortress, and one thing I had noted at the time is that > Fortress recommends 2.2V, 2.26V, and 2.3V for the setting for ChrgVtgFlo > (220-10), depending on which of three Fortress docs I read. I think I > ended up setting it to 2.26V after some experimentation. > > I can imagine a scenario where the voltage gets *slightly* too high, > activating the most trigger-happy of the battery's BMS's, and the resulting > sudden partial loss in load then causes a transitory voltage surge from the > SI, which then... > > Cheers, > > Kirk Bailey > k...@abundantsolar.com > > > On Sun, Nov 12, 2023 at 2:36 PM William Miller via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Jay: >> >> Good question. I assumed some kind of FET circuit but that is only my >> assumption. >> >> However an open relay exhibits some fairly high impedance. >> >> The symptoms indicate the SI shuts down but the batteries remain >> connected. Something allows 69 volts on the battery terminals… >> >> William Miller >> Miller Solar.com >> 805-438-5600 >> www.millersolar.com >> >> >> On Sun, Nov 12, 2023 at 2:22 PM Jay via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >>> Maybe someone else knows differently but it was explained to me that the >>> fortress batteries have a relay that disconnects the battery if the voltage >>> gets to high or low. There isn’t any electronic device to change battery >>> impedance besides what the actual cells are doing. >>> >>> Jay >>> >>> On Nov 12, 2023, at 12:50 PM, Jerry Shafer via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>> >>> Regarding the SI Inverters,for me it works best to eliminate the bat >>> temp sensor and put in a resister set to be 75 degrees, this will prevent >>> the charger over under charge issue. >>> Fun times >>> >>> On Sun, Nov 12, 2023, 12:36 PM William Miller via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>>> Friends: >>>> >>>> >>>> >>>> I am still working on getting the E-vaults to play nice with the Sunny >>>> Islands and Sunny Boys. >>>> >>>> >>>> >>>> With Open loop I was getting significant discrepancies in the reporting >>>> of SOC in the e-vaults versus that reported by the SI inverters. This >>>> discrepancy did not diminish over time. The discrepancy caused >>>> unacceptable charging and generator operations. >>>> >>>> >>>> >>>> I got Closed loop hooked up, but I found that every few days the SI >>>> inverters would shut down due to a battery over-voltage condition. I >>>> believe that when the e-vaults are near 100% SOC the BMS units increase the >>>> battery impedance which means any charging current applied will cause the >>>> voltage spike I have been seeing. I was able to measure these conditions >>>> myself on site, although they were very fleeting and required recording >>>> with the Fluke87 Min-Max function (love this meter!). >>>> >>>> >>>> >>>> I was able to extract log files from the Sunny Island primary inverter >>>> and perform some analysis. It appears when I turned on remote BMS on the >>>> SI (as part of the Closed loop protocol) it disabled the Frequency-Shift >>>> Power Control. This means the SI inverters have gone from having poor >>>> control over battery charging to having no control over battery charging. >>>> >>>> >>>> >>>> I have documented my research here >>>> <https://millersolar.com/MillerSolar/case_studies/36_SIFortress/36_SunnyIslandFortressIntegration.html#Inhibit>. >>>> There is a table of contents to take you to the latest information. I >>>> appreciate pertinent comments any of you might have. >>>> >>>> >>>> >>>> By the way, if anyone has called SMA tech support for help on a Sunny >>>> Island system, you have likely been asked to extract log files, zip them up >>>> and send them off for review (and waited a long time for a reply). I am >>>> the kind of guy who does not like to wait for solutions and who likes to >>>> figure out things for himself. I have taught myself how to evaluate those >>>> log files. I will be posting a web page on the subject. In the meantime, >>>> if you are interested, two of my analysis Excel sheets are linked in the >>>> case study. I will be expanding on this and providing resources to any >>>> integrator that wants that knowledge. >>>> >>>> >>>> >>>> Thanks in advance for any insight. I hope I am wrong about this and I >>>> am just missing something. I also hope revealing my headaches will help >>>> someone someday… >>>> >>>> >>>> >>>> William >>>> >>>> >>>> >>>> Miller Solar >>>> >>>> 17395 Oak Road, Atascadero, CA 93422 >>>> >>>> 805-438-5600 >>>> >>>> www.millersolar.com >>>> >>>> CA Lic. 773985 >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> List sponsored by Redwood Alliance >>>> >>>> Pay optional member dues here: http://re-wrenches.org >>>> >>>> List Address: RE-wrenches@lists.re-wrenches.org >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> There are two list archives for searching. When one doesn't work, try >>>> the other: >>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>> >>>> List rules & etiquette: >>>> http://www.re-wrenches.org/etiquette.htm >>>> >>>> Check out or update participant bios: >>>> http://www.members.re-wrenches.org >>>> >>>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. 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